A definite length of ported sensor cable, designed to be buried around the perimeter of a secure area. The cable emits radiowaves which create an invisible, electromagnetic detection field. The alarm monitoring equipment is activated through an impedance change in the field created by the presence of an intruder within the sensor range. Excludes items not having an external power supply or control system.

A electrical operated device which detects the presence of smoke and sounds an alarm, and/or lights a warning light of distinctive color when the concentration reaches a dangerous level. Excludes, ALARM, GAS, AUTOMATIC.

A device designed to detect the presence of predetermined amounts of smoke, dust, and the like, within the measuring area. The presence of any of these substances causes a change in the output signal of the device, which relays a warning message back to a central panel. The device itself does not provide any audible or visible output, or analyze chemical content. Excludes ALARM, SMOKE, AUTOMATIC.

An electronic device which is used as the central processing element of a system. It receives, processes and transmits fault signals to other elements in the system. Excludes ALARM-MONITOR and ALARM,AUDIBLE-VISUAL.

A device designed to detect the presence of predetermined amounts of smoke, dust, and the like, within the measuring area. The presence of any of these substances causes a change in the output signal of the device, which relays a warning message back to a central panel. The device itself does not provide any audible or visible output, or analyze chemical content. Excludes ALARM, SMOKE, AUTOMATIC.